Run the tester over the specified range of years. Available data
runs from 2003 through 2023 for most screens. You may
start at any month of the year, but other than January can only run
Stocks are picked from the screens every holding period (between
1 and 120 months) and held for that period.
Instead of selecting from the available screens, you may choose to
enter codes from any of the backtesters to
create hybrid tests. Simply copy the link listed at the top of a run and
paste into the form. Also see the backtester code
You may give your backtest a name for convenience. If you use
this backtest code in other testers, its name will be shown instead of
a full description.
Start with an initial investment. You may also add more
money periodically. You can also subtract from the portfolio by adding
a negative amount.
Instead of adding or subtracting a fixed amount, you can elect to keep
the portfolio at a fixed allocation. This is useful for testing
costs without considering the effects of compounded growth, to see what
your money might do this year.
Normally, the stocks held in a screen are rebalanced on every
trade. You can also specify to never rebalance, which may allow one
stock to dominate a screen as it grows, or rebalance at a fixed interval
(which must be a multiple of the holding period).
You can pay a fixed commission (which is applied to every buy
and sell) as well as a percentage spread (half applied on buy,
half on sell).
Capital-gains taxes can be applied, both short-term and
long-term. Taxes may be taken out on every trade, quarterly, or
Screen rankings come out on Friday, and backtests are typically done
with the closing prices on the next Monday, one day after the
rankings. This lag between ranking and trading can be varied from
zero days (trade on Friday) and upward.
Screen of Screens Backtest instructions
Choose which screens to select the stocks from. You may limit
choices to stocks that appear on some minimum number of screens or
unique screen categories (i.e. Keystone, RS, etc.). Note that
the concept of "unique" only applies to a limited subset of the
The stocks in each screen are ranked, counting down from the first
stock to the specified position (or all stocks if no
position is specified). The first stock gets max points
(max defaults to position), the second max-1,
and so on. The totals for each stock are then sorted, and the highest
limit stocks are chosen. In the case of a tie, a secondary sort
is done by looking at each screen in sequence, and selecting the stock
that appears first.
Another popular SOS tool is the
Saucer, which allows you to generate
a list of current rankings for SOS combinations.